/ Thesaurus / T Synonyms of thermos bottle Find synonyms for: Noun1. thermos, thermos bottle, thermos flask, vacuum flask, vacuum bottleusage: vacuum flask that preserves temperature of hot or cold drinksWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language